Normal flora ________ colonization of pathogenic organisms

A) promote
B) prevent
C) maintain
D) accelerate


Answer: B

Biology & Microbiology

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What will be an ideal response?

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The meiosis that produces the megaspores is

indicated by a. A. b. B. c. C. d. D. e. E.

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If transcription of this gene occurs from left to right in the accompanying diagram, which DNA strand is the coding (non-template) strand?

A) impossible to determine B) B C) C D) D E) E

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Why doesn't every cell in the body respond to every hormone circulating in the bloodstream?

a. Each cell has a limited number of protein channels that shuttle hormones through its membrane. b. Not all hormones can diffuse through all cell membranes. c. The concentration of some hormones is too low to stimulate every cell. d. Each cell has specific surface receptors, which interact only with hormones that they recognize. e. Although all hormones bind to all cell surfaces, some cells lack second messengers for expression.

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